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^2. William Clifford (1956), "On the Space Theory of Matter," The World of Mathematics, p.568, Simon & Schuster, NY

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^7. Milonni, P.W., Cook, R.J., and Goggin, M.E. (1988) "Radiation pressure from the vacuum: Physical interpretation of the Casimir force", Phys. Rev. A, Vol. 38, No. 3, p. 1621-1623.

^8. Michio Kaku (1994). “Hyperspace. A Scientific Odyssey Through Parallel Universes, Time Warps, and the Tenth Dimension”, Oxford University Press. N.Y. 432 pp.

^9. A.Rueda & B.Haisch (1998), "Inertia as reaction of the vacuum to accelerated motion", Physics Letters A, Vol. 240, No. 3, p.115

^10. S. De Curtis, J. Fernández Ferrer (1998), "Physik", Neuer Kaiser Verlag, 95 pp. (in German)

^11. Bernhard Haisch & Alfonso Rueda (2000), „Toward an Interstellar Mission: Zeroing in on the Zero-Point-Field Inertia Resonance”, AIP Conference Proceedings of the Space Technology and Applications International forum (STAIF-2000) Conference on Enabling Technology and Required Scientific Developments for Interstellar Missions, Albuquerque, NM, p. 1-7.

^12. Carlos Calvet, “Effects and Evidence of the "Background Field"”, Journal of New Energy, Vol. 4, no. 4, Spring 2000, p. 12-23

^13. Carlos Calvet, “Detection and Origin of the Background Field”, Journal of Theoretics, Vol.2, No.4, Aug 2000